Step 1: What you need

Two bike forks
wheels for the forks
A piece of 10' steel electrical conduit that can fit (snuggly-ish)over the head of the bike fork. 1" conduit worked for me
A piece of thinner conduit, also steel. This is to make a brace or two
A sturdy piece of wood. I initially used a broomstick, which prompty shattered. A 2x3 worked (and is still working...)
Two old bike inner tubes. Get these from the dumpster behind a bike store, or your enemies' bikes

the plumbing pipes in the picture have nothing to do with the project--they're just living their lives, not bothering anybody, so I say, live and let live, right?

Step 2: Ways to build it

I can think of three ways to assemble this, all of which would work pretty well.
The differences are how you attach the bits of conduit to one another.

You could:
Weld
Bolt
Lash with inner tubes

I used a MIG welder, because I wanted welding practice. If you wanted to bolt instead, every time I weld two pieces together, you would drill a hole through them and stick a bolt through it. You'll probably want to whack the conduit a bit where you'll be drilling to flatten it out.
If you're lashing, then just lash, man.

THIS IS REALLY IMPORTANT!
If you're welding, be sure that you don't have galvanized conduit. Seriously--welding galvanized steel frees criminal molecules that had been locked up in their metallic prison, and the criminal molecules run through the air into your lungs and try to kill you. So seriously, don't weld galvanized stuff.

also, if you're welding, make sure all your conduit is steel. Otherwise it probably won't work.

if you don't want to weld the forks into the frame, how else could you do it securely? i'm thinking of making a trailer similar to this, but out of pvc pipe. i don't know how to keep the forks secure, though.

drill a hot through the fork stem and pvc strait and put a bolt and a llock nut to hold it i dont know a bout pvc i know it is weak and flexable you probable will want to sue wood or steel pip and rent or buy a cheap welder the wlder will e useful for other stuff too

Industrial tube benders have springs that go inside the tube to stop it crimping. I think you can also protect it by filling the tube with sand before you bend it. The principle is just to get something flexible enough to bend inside the tube but which will resist the tube being compressed.

if you don't want to weld the forks into the frame, how else could you do it securely? i'm thinking of making a trailer similar to this, but out of pvc pipe. i don't know how to keep the forks secure, though.

Incredibly ingenius use of an old inner tube. Some folks would have gone to great lengths to come up with a nuts-and-bolts approach to attaching the tongue, whereas you have accomplished it quick, easy, and much faster. Well done!

I've not done much with innertube lashing, so I don't know how much friction it would provide for the hole here. I was thinking you might want to drill a hole 6" or so from the end of the wood (6" from the front), and put a nail (with the point filed/ground off) through it. You could bend a rounded 90 degree angle into it, so it could hook around your seatpost a bit. This might be a good idea (especially with heavier loads).

That's quite a substantial load. I was seriously considering building one of these, but I'm in a dorm building on a college campus, and my spare bike parts are at home, so I don't have them with me and I have no place to store it.

And then, a few months ago, my bike got stolen. It was right after I put on the chrome fenders that I had brought back from the junk bike I bought in Japan when I was there, too. But other than that, it didn't have much worth left to it other than being an abusable college-student bike (front derailer=gone, rear derailer=3 or 4 gears, instead of 5, depending on its mood, rear brake=gone, a spoke or two on the rear wheel=gone, tires and most of the non-painted parts=crapped up and nasty from the better part of a year and a half of sitting outside through rain, snow, freezing cold, boiling heat).

I miss it though. I do a lot of walking now. I loved riding in snow last winter.

i made a trailer for my sons tricycle using conduit tibes. after bending the two tube in an s shape that i wanted (think flat shape), setting the at an angle to each other (think v shape). gave the frame a more refined /three dimensional appearence.

yea, Bending conduit can be frustrating. if you don't have a friendly electrician around whose 1" pipe bender you could borrow, you can use the crook of a tree or two structural pieces of a iron fence about 2-6 inches apart. the narrower the easier, then every 1/2 inch give the pipe a shove and bend it about 20 degree's. you do that 4 times and you have your 90 degree bend(don't worry about the math there:I) NOTE the wider the crook of the tree, the smaller a bend you make, otherwise you still can crimp the pipe, so find some TIGHT CRACK between some structural steel. a good place is in the frame work of a billboard sign...

Agreed. Prank, you ought to build a doodad that attaches to the seat post and I guess the axel of the rear wheel and makes sort of a triangle. The trailer would be more stable, be far more flat (however flat you'd like it to be), and you'd probably have an easier time making turns. Just a simple cross piece that clears the back wheel and is lowered a bit.

That sounds like a totally good idea. As far as stability goes, though, my preferred technique is to ride ricockulously unstable bikes to begin with, such that they really can't get any worse. I think it gives me a more optimistic view of life....

Breathing in the fumes from welding galvanized steel and iron doesn´t kill you it only makes you sick enough to wish it did. Here in sweden its called "Galv-frossa" which means literly the "galvanized-shakes" but a better expression would probably be "the Zink-shakes" beacuse its the fumes from the heated Zink-layer that is the culprit. Its quite common among foundry/steel-workers who work with galvanised steel here in sweden and they supossedly build up an immunity to the shakes over time.

Yeah, but if you're in an area with crappy ventilation, I heard it can wreak havoc with your system. An interesting thing a friend was telling me--In the US, Galv-frossa is called Monday Night Fever. Professional welders can get a tolerance for zinc fumes over time, so during the week, when they are constantly exposed to fumes, they are pretty immune to it, but over the weekend, their tolerance drops back down, so they all get sick monday night. The first time I welded, I got horrible flu-like symptoms within about an hour. I was welding bike tubing, so I still don't know what caused it, since I don't think that it's galvanized. Maybe I missed some paint when I was grinding a clear spot to weld, and breathed paint vapors. Anyway, it sucked.

That definitely would be cool. I lack a welder, but I have about half a dozen or more bikes in my garage. My neighbors just come over and leave their crap at our house - we've got some of their cups in the cabinet. I think they'd like it if I welded together their bikes, or turned it into a trailer.

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